Made for 6th edition ruleset. 

A wizard may challenge an enemy Wizard to a duel using the rules on page 99 of the rulebook with the following exceptions:

They do not have to be in close combat.

Both of they must not be in close combat fight with an enemy and they may not enter in base contact with each other.

 Wizard Duels

A wizard may challenge an enemy Wizard to a duel using the rules on page 99 of the rulebook with the following exceptions:

They do not have to be in close combat.

Both of they must not be in close combat fight with an enemy and they may not enter in base contact with each other.

The duels are solved in the following way:

The attacks are solved in the challenger's magic phase, in this phase the Wizard with the highest initiative goes first, if they both have the same initiative, then roll a d6 to see who goes first. The wizard may choose a spell and cast it on the opponent, only after that spell is cast, the results and rolls required are done, may the other wizard cast his own magic at the other wizard, after that spell is cast, the results and rolls required are done, the wizards may continue this procedure until their casting dice are spent, or one of them dies.

The wizards may also cast a magical shield using their dispel dice at the same time the other wizard casts a spell at them:

Shield of Mana- 6+

If successful, the attacking wizard rolls -1d6 (for the spells that require d6 to determine number of hits) and -1 strength (for all spells that have a strength stat)